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No raster no audio,Zenith SJ 2065S5

No Raster no audio.The horizontal output transistor gets very hot..Please advise

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1. the tester set to 250 up dc vlts 2. the neg - grn of the tester put the grn - in the picture tube 3 the pos.+ of the tester test to colector of the output transistor center legs the (H OUT) 4.look for the 120 or 130 vltsDC if the supply is normal. set the tester to 10 AC vlts test the pos.+ of the tester to BASE. and power on if no supply for AC. no oscillation check the jungle IC good luck

Posted on Sep 20, 2007

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As horizontal transistor gets very hot so no eht so no raster &no sound due to nosupply to vif & tuner. as hor output is getting hot please isolate supply to hor. section & check power supply output is ok as due to high voltage h/outout may get hot & demaged. if supply is ok check for leaky or short parts in hor output. 1 hor. output transistor itself if it is replaced that may not be of proper matching. 2 diode& cap.in eht section. 3 clean print near eht. 4 moisture near yoke due to rain in rainy season only. so keep it hot for few hours. 5 at last if all are ok eht or fly back transformer. re connect power to hor output after rectification

Posted on Sep 19, 2007

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1 Answer

When tv is powered on tv only displaying channel number and sound -no raster. using video mode displays are ok. sound is also ok


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Dec 06, 2014 | Sharp Televison & Video

1 Answer

My tv will power on but have no raster its completely black. B+ plus voltage with respect to ground is 110 volts dc.


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Do a search by type in the brand name of your device at its search box.

Jun 08, 2014 | Panasonic Televison & Video

1 Answer

Videocn tda 9370 if no raster & retraseline please help


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Apr 02, 2014 | Televison & Video

1 Answer

Green light is on but no picture visible, black screen


lack of raster : test the power supply b) horizontal output c) output transistor d) HV rectifier e) Flyback.

God bless you

Sep 25, 2012 | Mitsubishi WS-55807 TV

1 Answer

Green light is on but screen is black no picture


problem lack of RASTER: test the a) power supply b) horizontal output c) output transistor d) HV rectifier e) Flyback,
God bless you

Sep 25, 2012 | Mitsubishi Televison & Video

1 Answer

MY TV DONT HAVE ANY DISPLAY WHATS PROBLEM


this a lack OF RASTER.
2) test the power supply
3) test the output for horizontal output for +125vdc
see the horizontal output transistor, flyback, +Rectifier HV.
4) test the vertical out put +80Vdc
See the block diagram
God bless you
9_23_2012_12_58_31_pm.png

Sep 22, 2012 | Televison & Video

1 Answer

Monitor no raster power has been ok


Hello,

The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply.
Assuming there is no deflection and no High Voltage, you either have a low voltage power supply problem, bad start up circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection.

Check for bad fuses.

(If you have High Voltage as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).

Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.
Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.
If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.
If there is voltage and no deflection (no high pitched whine and no HIGH VOLTAGE), you probably have a start up problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osc. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate.
Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for start up problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky - you can blow things up if not careful (including yourself).

If you hear the high pitched whine of the deflection and/or feel some static on the scree, confirm that the horizontal deflection and high voltage are working by adjusting the SCREEN control (probably on the flyback). If you can get a raster then your problem is probably in the video or chroma circuits, not the deflection or high voltage.

hope this helps......

Aug 06, 2010 | SAMTRON 77V 17" CRT Monitor

1 Answer

Horizontal Output Transistor


This philips board give many problems with no raster. Most times its Horizontal and sometimes it transformers I have found it would be much simple to buy board or send off to be repaired. Pts 1800-844-7871 is the best bet. You also can get hot at places like MCMelectronics, bluestar international, tritronics. If you do not want to buy board.

Sep 18, 2007 | Televison & Video

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